you could go with bi-amped 6x9's, if you can return your pioneers. Jbl power series are bi-ampable, but you will have to exclude their outboard cross overs. I would ensure that your system is bi-amped before doing this though. Another option, though it may void your warranty is to cut the tweeter leads in the 6x9 and attach them to the tweeter leads from the amp, and do t same for the mids. I've done this before with good results off an aftermarket amp, with your factory amp, you should know what you're doing before you try it as the tweeter leads may not be able to handle a lower impedance load.
Just a few ideas that may work for you.

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2004 300M SPECIAL
Alpine CDA 9833
Alpine Pxa-h701
Alpine Rux-c701
Rockford fosgate p400-4
Rockford fosgate p4004
Hifonics BX 1205D
JBL c608 GTi
JBL p963
Infinity 2.5" center channel
Alpine type R 12"(2)
200 amp alternator
yellow top battery
0 awg power and ground (welding cable) 300 amp anl fuse
all active SQL set up with 2000 watts rms